*{
    margin: 0;
    padding: 0;
    list-style: none;
    box-sizing: border-box;
}
html,body{
    width: 100%;
    height: 100%;
}
.box{
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
header{
    width: 100%;
    height: 45px;
    background: #f3f3f3;
}
main{
    width: 100%;
    flex: 1;
    overflow-y: scroll;
    
}
main dl{
    width: 100%;
    height: 100px;
    display: flex;
    justify-content: space-between;
    padding: 0 15px;
    margin:  5px 0;
}
main dl img{
    border-radius: 15px;
    margin-right: 10px;
}
footer{
    width: 100%;
    height: 50px;
    background: #d5d5d5;
}